#include<iostream>
#include<stdio.h>
#include<algorithm>
#include<vector>
#include<string.h>
#include<math.h>
#include<map>
#include<iomanip>
#include<queue>

const long long INF = 1e6+7;
const long long MOD = 1e9+7;
const double PI=acos(-1);

using namespace std;

int main(){
	int a,b,c;
	cin >> a >> b >> c;
	int x=a/b;
	if(a%b!=0)x++;
	int y=a/c;
	if(a%c!=0)y++;
	double tmp=(double)x/3*2;
	if(tmp>=y){
		cout << "YES" << endl;
	}else{
		cout << "NO" << endl;
	}
	return 0;
}